Test Ruby 2.7.1 and 2.6.6 on travis
Test Ruby 2.7.1 and 2.6.6 on travis

neopoly/rubyfox-server,neopoly/rubyfox-server,neopoly/rubyfox-server,neopoly/rubyfox-server,neopoly/rubyfox-server,neopoly/rubyfox-server